An SHSH blob (which stands for "Signature HaSH") is a small file that contains specific signature information used by Apple devices to verify the integrity and authenticity of firmware during the installation or restoration process. Each firmware version for an Apple device has unique signing keys provided by Apple's servers, and the SHSH blob serves as a digital "ticket" that allows a user to downgrade or restore their device to a specific iOS version that is no longer being signed by Apple.
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